Climate change is increasingly framed in law as a question of justice as well as emissions. This paper reviews how legal frameworks for sustainable development evolved between 2024 and 2026 in response to that framing. Using a doctrinal and comparative review of primary authorities (three international advisory opinions, regional and domestic judgments, and key treaties) and recent scholarship, it asks whether emerging norms advance environmental justice, understood as fair distribution of climate burdens, meaningful participation, and effective remedies. The review finds consolidation at the international level: stringent due diligence, the applicability of State responsibility, erga omnes obligations, and a rights-based reading of environmental protection. Domestic and regional litigation is expanding rapidly but yields uneven outcomes, with causation, justiciability, and standing remaining decisive obstacles. Justice gains are clearest in procedural rights and recognition of vulnerable groups; historical responsibility, reparation, and finance remain largely unresolved. The paper concludes that the new jurisprudence supplies a strong normative baseline whose justice value depends on domestic legislation, accessible remedies, and climate finance reflecting differentiated responsibility.